CMF / CRF Details
CMF ID: 7713
Install automated section speed enforcement system
Description:
Installation of automated speed enforcement system. Determines average speed of vehicle over a long distance.
Prior Condition: No Point-to-Point Automated Section Speed Enforcement System
Category: Advanced technology and ITS
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.512 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.05 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 48.8 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 5 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Other Freeways and Expressways |
| Street Type: | |
| Minimum Number of Lanes: | 6 |
| Maximum Number of Lanes: | 6 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by Median |
| Minimum Speed Limit: | 80 |
| Maximum Speed Limit: | 80 |
| Speed Unit: | km/h |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based |
| Intersection Type: | |
| Intersection Geometry: | |
| Traffic Control: | |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details |
|---|
| Date Range of Data Used: | 2006 to 2011 |
| Municipality: | Naples |
| State: | notusa |
| Country: | Italy |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 345 crashes before, 130 crashes after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 08, 2016 |
| Comments: | CMFs of total crashes on horizontal curves, with radius varying between 200 and 3000 meters. The authors note that crash reduction effects decreased over time and speed, speed variability, and non-compliance to speed limits significantly increased over time. |
[View score details]